700 & 730 Commonwealth Avenue Garages
This project primarily consisted of retrofitting existing HID (High Intensity Discharge) lamps to a more energy efficient T8 fluorescent system with occupancy controls.
The existing lighting system in this area contained predominantly metal halide and a few high pressure sodium lamps. Existing lighting, which had previously stayed on 24/7, was replaced with super T8 fluorescent, cold temperature ballasts and Vapor-Tight lenses, which helps reduce moisture build up inside the fixture.
As with the Warren Tower project, occupancy sensors were installed in each zone. Fixtures with day lighting exposure (i.e. on the roof, top floor, and along the perimeter of the structure) have photocell controls to further reduce energy consumption.
Warren Tower Garage
This project is saving 283,500 kWh a year, which is equivalent to the CO2 emissions produced from running 37 cars or powering 28 homes.
The lighting design of this four-level parking structure had consisted of metal halide lamps, T12 fluorescent lamps with magnetic ballasts, and incandescent exit signs, all of which had been running around the clock.
Energy efficiency improvements included replacing all metal halide, T12 fluorescent, and magnetic ballasts, with super T8 fluorescent, electronic ballasts, and Vapor-Tight lenses, which, again, help prevent moisture buildup inside the fixture. Incandescent exit signs were replaced with LED units.
Because lighting on each level is controlled by a single contactor, occupancy sensors are tied together by level. Select lighting fixtures will remain hardwired and illuminated throughout the garage day and night as a safety measure.
This project has saved 546,000 kWh a year, the CO2 equivalent of powering 72 cars or 54 homes.
- Metal halide lamps in basketball courts, multipurpose courts, and the pool area, were replaced with T5 high output fluorescent systems equipped with electronic ballasts, acrylic lenses, and wire guards.
- All halogens were replaced with with LEDs or CFLs.
- Occupancy sensors were installed in the basketball courts, multipurpose courts, lockers, stairways, and mechanical rooms.
- All T8 to Super T8 lamps and efficient ballasts were re-lamped and reballasted.